Sound reproducing machine



Sept. 13, 1932; I ANGQLDSW'TH-Y] fi,s7 e,9134

SOUNDTREPRQDUCING'MACHINE 7 7 Original Filed Seprl. 9,1922 5sheets-sheet 1 o o o i:

16 INVENTOR I ALFRED N- GOLDSMITH v BY ORNEY P 13, 2 A. N. GOLDSMITH1,875,913

SOUND REPRODUCING MACHINE Original Filed Sept. 9, 1922 5 Sheets$heet 2'INVENTOR ALFRED N OLDSMITH LQM 4% A TORNEY Sept. 13, 1932..

A. N. GOLDSMITH 500m) REPRODUCING magma inal Filed Sept. 9.

1922' 5 Sheets-Sheet 3 Orig INVENTOR ALFRED N. GOLD SMlTH BY ikflgwdTORNEY- Sept. 13, 1932. A. N. GOLDSMITH s'ounn REPRODUCING MACEINEOriginal Filed Sept. 9. 1922 5 Sheets-Sheet 4 INVENTOR ALFRED N.GOLDSMITH nagwm A ORNEY Sept. 13, 1932. A. n. GOLDSMITH SOUNDREPRODUCING MACHINE Original Filed Sept. 9, 1922 5 Sheets-Sheet 5INVENTOR A ED N. GOLDSMITH BY eb WM A ORN EY Patented Sept. 13, 1932nmransraras Parser orrica oanrann n. eonnsnrrn, or ivrounr vnnnoimnnwYOBK,VA;SSIG1\TOR T0 RADIO coaronarion or AIJIERIGA,ACORPOBATIO1\T orDELAWARE SOUND REPRODU'GING MACHINE Original application filed September9, 1922, Serial 'No. 587,067, now Patent No, 1,721,151, dated. July 16,1929. Divided and this application-filed'l'uly 24, 1928. Serial No.295,029.

This application is .aldivisional application of my copendingapplication on a sound reproducing machine filed in the United StatesPatent Oflice September 9, 1922, Serial No, 587,067, which became'PatentNo. 1,721,- 151, July 16, 1929. a

This invention relates to sound reproducing machines, and an objectof'the invention is to provide a machine which will be very convenientin operation and willloe capable of aifording a Wider range of servlcethansound reproducing machines as formerly constructed: 7 1

To this end an important feature ofthe invent-ion resides in theprovision of a casing in whicha horn is installed and a member mountedon the casing for movement rela-,

tively thereto and supporting a set of sound 3 reproducing apparatus.The invention contemplates more particularly the provision of radioreceiving apparatus connectedto the horn of the machine and mounted inthe cover, the cover being so mounted on the body portion of the machinecasing and the radio receiving apparatus being so con structed andarranged that in the open position of the cover, the controllingelements of the radio receiving apparatus are disposed on the front faceof the cover in convenient position for manipulation by the operator.

In accordance with another feature ofthe invention, a casing is providedcomprising a plurality of portions connected together for relativemovement, and sets of soundreproducing apparatus are mounted inrespective portions of the casing. Preferably and in the illustratedembodiment of the invention, the sets of sound reproducing apparatusareprovided with controlling elements, which in the normal positions of theportions of'the casing'are contained within the casing so as to beinvisible, the controlling elements of the sound reproducing apparatusand the portions of the casing being, however, so constructed andarranged as to render the controlling elements visible upon relativemove ment of the portions of the casing. The controlling elements of oneset of sound reproducing apparatus in the normal positions of theportions of the casing are located close to'the controlling elements ofthe other set inorder to conserve space within the casing, and thecontrolling elements of the respective sets are separated from-eachother upon relative movement of the portions of the casing, so as torender them readily accessible to the operator.

A further important feature of the invention resides in the provision ina casing comprising a main body portion and a cover portion ofphonographic apparatus and radio receiving apparatus mountedrespectively in the body portion and the cover portion.

The cover is preferably formed in two parts, I

one of which provides a top wall for the cover and the other of which isin the form of a member spaced from the top wall to provide a chamberbetween the wall and said member.v within which the radio receivingapparatus is mounted, and the controlling elements of the radioreceiving apparatus are preferably extended through one of the parts ofthe cover for adjustment from outside of the chamber. In order to enablethe exterior surface of the cover to present a smooth and unbrokenappearance and to cause the controlling elements of the radio receivingapparatus to be disposed in a convenient position for actuation by theoperator when the cover is opened, one of the parts of the cover ispreferably formed as a panel supported within the other part, the radioreceiving apparatus being mounted on the panel and comprisingcontrolling elements extended through it for adjustment from the side ofthe panel which is exposed when the cover is opened, and the panel beingperforated to receive thevacuum tubes of the radio receiving apparatusin order to en ablethe tubes also to be rendered accessible from theexposed side of the panel for inspection and replacement. Theexposedside of the panel may be, and preferably is, also provided withmeans distinct from the controlling elements of the radio receivingapparatus for facilitating the adjustment of such elements.

In accordance with a still further feature of the invention, atwo-branch horn is provided within the casing of the machine and twosets of sound reproducing apparatus are connected respectively to thebranches of the horn. The machine also preferably comprises a device forcontrolling the operation of one of said sets of apparatus and means forautomatically shutting off communication between the main body of thehorn and one of its branches upon actuation of the device to causecommunication of sound to the other branch. In another aspect, theinvention contemplates the provision of a two-branch horn mounted in acasing and having phonographic apparatus connected with one of itsbranches and a telephone connected with its other branch, the telephonebeing in turn connected with radio receiving apparatus mounted in thecover portion of the casing.

The invention also aims to provide a radio receiver which may beemployed as an attachment for phonographs, said attachment beingconstructed so as to enable it to be mounted in the casing of aphonograph without increasing the size of the casing or reducing theavailable size of any of its compartments. Preferably and as shown, theattachment comprises a panel constructed to fit within the cover of aphonograph casing and radio receiving apparatus carried by the panel andconnected to the horn of the phonograph.

Still other novel and useful features of the invention, including theprovision of a door removably mounted on one side of the phonographcasing to enable ready access to be obtained to the compartment whichcontains the horn and the parts associated therewith, will appear as thedescription proceeds and will be pointed out in the appended claims.

In the drawings, in which like reference numerals designate like partsthroughout the various views Fig. 1 is a front view of the upper part ofa machine embodying the invention with the cover of the machine in openposition and with a portion of the machine casing broken away so asbetter to reveal the phonographic apparatus;

Fig. 2 is a view in perspective with the plate in the upper part of thecasing removed so as to reveal the horn;

Fig. 3 is a perspective view of thepanel supported in the cover and theradio receiving apparatus carried by it;

Fig. 4 is a perspective View taken from the rear of the machine and withthe door on the rear side of the upper compartment of the casing in openposition so as to reveal the horn and parts associated with it;

Fig. 5 is a view in sectional elevation from front to rear of themachine:

Fig. 6 is a plan view, partly broken away, of the construction at thejuncture of the main body of the horn and its branches;

Fig. 7 is a View of the machine in side elevation, partly broken away soas to show the radio receiving apparatus, the phonographic apparatus andthe several compartments of the casing;

Fig. 8 is a view showing the switch mechanism embodied in the radioreceiving apparatus; and

Fig. 9 is a diagrammatic representation of the circuit arrangement ofthe radio receiving apparatus.

The illustrated machine comprises a casing having a main body portion 2and a cover portion 4 hingedly mounted at the top of the body portion 2,as indicated at 6. The body portion 2 of the casing is of cabinet formand comprises compartments 8 for containing phonograph records, etc.,and a compartment 10 in its end in which is located a horn 12. The horn12' flares outwardly from its rear end to its forward end, designated by14, where it is connected with a wooden tube 16 which constitutes anextension of the horn 12 and is flared in continuation of the sides ofthe horn 12.

Preferably and as shown, the horn 12 is formed at its rear end with twobranches 18 and 20, the former extending upwardly and the latterextending first laterally and then forwardly within the compartment 10of the casing. The branch 18 of the horn is seated at its upper end inthe top wall 22 of the body portion 2 of the easing and is connectedabove the wall 22 with a tubular arm 24 of known construction in soundreproducing apparatus of the phonograph type. The arm 24 at its forwardend carries a sound box 26 which may also be of known construction andarrangement. The phonographic apparatus of the machine further includesa plate 28 mounted in an opening 30 in the wall 22 and a turntable 32journalled on the plate 28 and arranged to be rotated by a spring motor34 supported on the under side of the plate. The turn-table 32, isadapted to have a phonographic record placed thereon, and in theoperation of the phonographic apparatus the sound box 26, on the arm 24,is thrown forwardly from the position shown in Figs. 2, 5 and 7 in aknown manner to cause a needle 35 on the sound box to engage with andride upon the record.

The sound box 26 constitutes an element by means of which the operationof the phonographic apparatus may be controlled, and the phonographicapparatus also preferably comprises other controlling elements (notshown) of the kind usually provided for governing the rotation of thetable 32.

The lateral branch 20 of the horn 12 is connected to a second soundreproducing apparatus which is of the radio receiving type. As shown,the branch 20 is gradually tapered inwardly to its forward end whereit'is provided with a telephone 36 connected with the radio receivingapparatus. The cover por tion 4 of the casing of the machine is preferably constructed in two parts, one of such parts being in the form of apanel 40 sup ported within the other part and spaced from the top Wall42 of the other part to provide a chamber 44 between the parts. Thechamber 44 of the two-part cover is adapted to contain radio receivingapparatus, and in order to enable the chamber to be made of sufiicientsize to contain the radio receiving apparatus and yet avoid mechanicalinterference With the phonographic sound box 26, even though the spacewithin the cover is small, the panel 40 may be inclined downwardly fromthe rear end to the forward end of the cover, with relation to its topwall 42, as clearly shown in Figs. 5 and 7. 2

In the illustrated construction, the radio receiving apparatus comprisesa primary inductance coil 46 mounted on the panel 40. 3, in coupledrelation with a smaller coil 48, which is interposed in the circuit of asecondary inductance coil 50. The primary and secondary circuits of theradio receiving apparatus include condensers 52 and 54 respectively. Asshown, the condensers are of the type comprising semi-circular plateswhich are alternately fixed and movable. The movable plates of thecondenser 52 in the primary circuit are mounted on an arbor 56 whichextends through the panel 40 of the cover and is provided on the exposedside of the paneloutside of the chamber 44 with a disc 58 co-acting witha pointer 60 carried by the panel. Fast on the end of'the arbor 56Within the chamber 44 of the cover is arelatively large spur gear 62meshing with a small pinion 64 fixed to the end of a stud shaft 66. Theshaft 66 is also extended through the panel 40 and is provided on theexposed side of the panel with a knob 68 which may be turned to adjustthe condenser.

The condenser 54 in the secondary circuit of the radio receivingapparatus is similar in general construction to the condenser 52 in theprimary circuit and includes an arbor 70 extended through the panel 40and provided on the exposed side of the panel outside of the chamber 44with'a disc 72. In order to guide the uses of the machine in adjustingor tuning the radio receiving apparatus. the disc 7 2 is preferablygraduated or indexed with its front face, as clearly appears from Fig.1, and has associated with it a pointer 74 carried by the panel 40.Mounted on the end of the arbor 70 within the chamber 44 is a spur gear76 which meshes with a small pinion 7 8 on a stud shaft 80, alsoextended through the panel 40 of the cover and provided on the exposedside of the panel with a knob 82 by which the condenser 54 may bereadily adjusted.

i The radio receiving apparatus comprises are employed, and the panel 40is formed with a single rectangular opening 94, extendin substantiallyfrom side to side of the cover 4 and containing a similarly shaped plate96 spaced at its edges from the edges of the opening 94 so asto befreely movable relatively to the panel 40. The plate96 is provided onits'exposed face with supports 98, Figs. 5 and 7, upon which the vacuumtubes are mounted in substantial parallelism With the plate 96. Anapertured plate 99 is mounted on the panel 40' within the chamber 44 insuch a position as to prevent access to the parts within the chamber 44from being obtained by pushing back the plate 96 in the opening 94 ofthe panel. In order to prevent shocks to which the cover'4'fof thecasing may be subjected from being transmitted to the vacuum tubes84-92, the plate 96 is yieldably supported on the panel 40; As shown,the supporting means comprises posts 98 located adjacent to the cornersof the plate 96 and connected by relatively stiff coiled springs 100with posts or screws 102 mounted onthe panel. The springs 100 may befilled with absorbent cotton or other suitable material for damping anyvibrations of the plate 96, caused by movement of the cover. It isrecognized that the arrangement of the vacuum tube with relation to thepanel 40 may be widely varied; for example, the tube may be located inseparate openings in the panel and may be disposed at right angles toit.

The circuit of the secondary inductance coil 50 .and condenser 54 isconnected to the grid of one of the vacuum'tubes, for example, the tube84, the plate circuit of the tube 84 including a switch 104 at the lefthand end of a switch block 106, Fig. 3, mounted on the panel 40. Asshown, the switch 104 includes a segment 108 composed of brass or othersuitablemetal, four contact studs 110, and a contact member 112 carriedby a member 114 pivoted centrally on the switch block 106 and composedof insulating material.

The contact member 112 comprises parts are ranged for engagement withthe segment 108 and one of the four contact studs 110 depending upon theposition of the member 114 on the switch block 106.

Each of the four contact studs is'connected with the primary coil of oneof four radio" frequency transformers 116, supported on the panel 40within the chamber 44 of the cover 4, the secondary coils of thetransform ers 116 being connected to each of four contact studs 118 of aswitch 120 at the other end of the switch block 106. The switch 120 alsocomprises a segment 122 arranged to be connected with any one of thestuds 118 by a contact member 124 carried by the pivoted member 114 andhaving parts arranged for engagement respectively with the segment 122and one of the studs 118.

The inductance of the primary and secondary coils 46 and 50 may berespectively regulated by suitable switches. As shown in Fig. 8, theswitch for the primary inductance coil 46 comprises a contact post 126connected with the antenna circuit, and a contact member 128 fulcrumedon the post 126 and movable into engagement with any one of a series offour contact points 130 connected to suitably spaced taps along the coil46. The switch for controlling the inductance of the secondary coil 50comprises a post 132 in circuit with the coupling coil 48 and havingfulcrumed thereon a contact member 134 movable into engagement with anyone of four contact studs 136 electrically connected to the secondaryinductance coil at spaced points along the coil. The contact members 128and 134 extend beyond their fulcrum posts 126 and 132 respectively andare connected to a bar 138, which in turn is operatively connected to alever 140 fixed to a stud shaft 142 mounted upon and extending throughthe panel 40 of the cover. The lever 140 is formed with a laterallyextending portion 144 pivotally joined to one end of a bar 146, theother end of which is pivotally connected to the member 114 of theswitches 104 and 120 so as to operate the switches 104 and 120simultaneously with the movement of the bar 138 and the consequentoperation of the switch members 128 and 134 of the inductance coils. Thestud shaft 142 is provided on the side of the panel outside of thechamber 44 of the cover 4 with a knob 148, and arranged for movementwith the knob 148 is a pointer 150 coacting with a segmental scale bar152 fixed on the exposed side of the panel 40 and preferably graduatedto indicate the wave lengths for which the inductances of the coils 46and 50 are adjusted.

The segment 122 is connected to the grid of vacuum tube 86, the platecircuit of which includes the primary of a step-up transformer 152supported by a bracket 154 on the inner side of the panel 40. Thesecondary of the step-up transformer 152 is interposed in the gridcircuit of the vacuum tube 88, and the plate circuit of the tube 88 inturn includes the primary of a transformer 156 sup ported by a bracket158 mounted on the panel 40 adjacent to the transformer 152. Thesecondary of the transformer 156 is connected in circuit with the gridsof both of the vacuum tubes 90 and 92, and the plate circuit of thetubes 90and 92 comprises the primary of a transformer 160 supported onthe panel 40 by a bracket 162. As shown, the brackets 154, 158, and 162of the transformers 152, 156 and 160 respectively are mounted on thepanel 40 adjacent to the edge of the plate 99 which surrounds theopening 94 in which the vacuum tubes are located.

Mounted on the inner surface of the panel 40 between the radio receivingapparatus and the panel is a metal plate 164 which serves as anelectrostatic and magnetic shield for the radio receiving apparatus. Themetal plate 164 further provides a convenient means for groundingcertain of the circuits of the apparatus. The parts of the radioreceiving apparatus which are not grounded are insulated from the metalplate 164 and may be supported on posts or legs 165, such as are shownin connection with the primary inductance coil 46. The metal plate 164is connected to ground by means which will be hereinafter more fullydescribed, and which includes terminal blocks 168 and 170 locatedrespectively on the panel 40 and in the upper part of the main body ofthe casing, of the ma chine and at the rear of the machine.

As shown most clearly in Figs. 5 and 7, the primary inductance coil 46,coupling coil 48 and primary condenser 52- are housed in a metallicshield 171 shaped to correspond with the inner surfaces of the cover 4.The secondary inductance coil 50 and the secondary condenser 54 arehoused in a similar shield (not shown). The shields 171 are mounted onthe ground plate 164 in spaced relation to each other and act not onlyto prevent physical injury to the enclosed parts during the insertion orremoval of the panel 40, but also to shield the two circuits fromelectrostatic and magnetic fields produced by external agencies and toprevent electrostatic or magnetic interaction between the two circuits.

The circuit arrangement and manner of operation of the radio receivingapparatus will be best understood by reference to Fig. 9 in which theantenna is designated generally by 172 and is joined to a connectingstud 174 on the terminal block 170 supported on the main body portion 2of the casing. From the connecting stud 17 4 the antenna current passesalong a flexible lead 17 6 to a connecting stud 17 8 on the terminalblock 168 located on the panel 40. A wire 180 conducts current from thestud 178 to the contact ost 126 of the switch 128 of the primaryinductance coil 46. From the switch 128 the current passes through asmaller or larger portion of the length of the inductance coil 46,according as the switch is arranged to engage the contact point 130A,130B, 130C or 1301). As shown, the switch. 128 is in contact with thepoint 130C, so that a relatively large portion of the inductance of theprimary coil 46 is included in the antenna circuit. The antenna circuitis continued through the primary tuning condenser 52 and'then'ce toground through the metal plate 164. The connections between the metalplate 164 and ground include a wire 181 attached to a connecting stud182 on the terminal'block 168, a flexible lead 184 connecting'the stud182 to a stud 186 on the terminal block 17 O and a wire 187 leading fromthe connecting stud 186 to ground. A second wire 188 connects the stud186 to the negative side of a battery 166 (Fig. 9). V

The coupling coil 48 in the secondary circuit of the radio receivingapparatus is connected at one of its ends to ground by a wire 194 and atits other end to the contact post 32 of the switch 134 of the secondaryinductance coil 50. Assuming that the switch 128 of theprimaryinductance coil 46 is set to contact with thestud 130 .C, then byre'a-. son of the common operating bar 138 for the switches 128 and 134,the switches 134 of the second inductance coil 50 will be set to contactwith stud 136 C so as to cause the inductance in the secondary tuningcircuit of the radio receiving apparatus to correspond with theinductance in the primary or antenna circuit. The end of the inductancecoil 50.0pposite from its connection with the switch 134 is connectedwith the grid of the Vacuum tube 84, and the secondary tuning condenser54 is connected in shunt with the coupling coil 48 and inductance coil50. j

' The vacuum tube 84 acts as a-radio frequency amplifier, and its platecircuit is taken from the battery 166 through a wire 196 at a suitablevoltage, for example, volts, to a connecting stud 198 on the terminalblock 170. The stud 198 is joined by a flex: ible lead 200to aconnecting stud 202 on the terminal block 168 of the cover 4. A wire 204connects the stud 202 to a conductor206 which is in turn connected tothe primary coils of the radio frequency transformers 116. As shown, thecurrent passes through the primary coil of the transformer 116 C to thecontact stud 110 G of the switch104. The contact member 112 of theswitch 104 conducts thecurrent to segment 108 of the switch, and fromthence to the plate of the vacuum tube 84. The plate circuit ofthe tube84 is completed by connecting the filament of the tube to groundthroughthe metal;

plate 164. e 7

Each of the secondary coils of the radio frequency transformers 116 isconnected at one end to ground through the metal plate 164 and at itsother end to one of the contact studs 118 of the switch120. In theillustrated position of the parts, the current passes from the secondarycoil of the transformer 116 C to the stud'118 C then through thecontactmember 124 of the switch 120 to the segment 122 and from thenceto the grid of thevacuum tube 86. The illustrated ma-v "chine isparticularly designed to receive As clearlyappears from Fig. 3, theradio frequency transformers 116A, 11613, 1169 and116Dprogressively-increase in size from 116A to116D and have varyingconstants corresponding respectively to the constants of the primary andsecondary tuning circuits when the switches 128 and 134 are inengagement with the contact studs (130, 136) A, B, C and D. It will alsobe understood that,rif the contact members. 112 and 124 of the. switches104 and 120 are in contact with the studs 110A and 118A, the platecurrent of the vacuum tube 84 will not pass through the transformer 1160but will pass througlrthe primary coil of the transformer 116A, and thegrid of the detector tube 86 will be connected to the secondary of thetransformer 116A insteadof to the transformer 116G; Manifestly, if theswitches 104and 120 are set at the contact posts (110, 118) B or D, theradio. frequency transformer 116B or D respectively will be connected inthe radio re-;. X

ceiving circuit. It will be apparent from the description heretoforegiven of the connec' tions between the switches 128, 134, 104 and 120not only that the constants of the secondary tuning circuit are changedin accordance with changes in the tuning of the primary circuit, butalso that the constants of the radio frequency transformer apparatus arecorrespondingly changed simultaneously with changes in the constants ofthe tuning circuits. Y The plate circuit of the vacuum tube 86 includesthe conductor206 and its connections with the battery 166 and furtherincludes a wire 214 leading from the conductor 206to one end of theprimary coil of the step-up transformer152. The other end of the primaryof thetransformer ;152;is connected with the plate of the tube 86, andthe plate leading to a connecting stud 222 on the terminal block 168.The connecting stud 222 is in turn joined by a flexible lead 224 with astud 226 on the terminal block 170, and a wire 228 leads from the stud226 to the battery 166. As indicated in Fig. 9, the wire 228 isconnected to the battery 166 at a point having a potential of 3 voltswith respect to the negative end of the filament, inasmuch as excellentresults have been obtained in practice from the use of such potential.

The plate circuit of the audio frequency amplification tube 88 includesthe primary coil of the transformer 156 and a wire 230 connecting thecoil with the conductor 206. The above circuit is completed through thefilament to ground at the metal plate 164.

The secondary coil of the transformer 156 is arranged in the gridcircuits of both of the vacuum tubes 90 and 92, the arrangement beingsimilar to the so-called-push-pull circuit, already known in the art.The secondary coil of the transformer 156 is also connected by a wire232 to the conductor 220 leading to the battery 166 through the wire228. The plate circuits of the vacuum tube 90 and 92 include theconductor 206 which is common to all of the tubes. The connection of thefilaments of the tube 90 and 92 to ground at the metal plate 164completes their plate circuits. The circuits of the vacuum tubes 90 and92 afford a second step of audio frequency amplification in addition tothe first step produced by the tube 88.

The current for heating the filaments of the vacuum tubes 8492 is takenfrom the battery 166 at relatively low potential, such as, for example,4, 5 volts, and is conducted along a wire 234 to a connecting stud 236on the terminal block 170 and from thence through a flexible lead 238 toa connecting stud 240 on the terminal block 168. The current then passesto a conductor 242 common to the filaments of all of the vacuum tubes.The heating circuits are completed through the connection of thefilaments to the metal plate 164.

The plate circuit of the second audio frequency amplification unitcomprising the vacuum tubes 90 and 92 is transmitted by the transformer160 to a circuit including a wire 244 joined at one end to thegroundplate 164 and at its other end to a connecting stud 246 on theterminal block 168. The stud 246 is in turn connected by a flexible leadwire 248 to a stud 250 on the terminal block 170, from which a Wire 252leads to a switch 254. The switch 254 is normally closed so that thecurrent induced in the wire 244 is conducted through a binding post 256and wi're'258 to the telephone 36 mounted on the lateral branch of thehorn 12. The return circuit of the telephone is through a wire 260 tothe wire 188 and thence to the battery 166 and ground. A condenser 262is preferably arranged in shunt with the telephone 36 to im prove thetone of the speech or music delivered thereby.

In order that external headband or ear telephone receivers may beemployed, when desired, to enable reception from distant broadcaststations or to enable one or more persons to receive speech or musicfrom the radio receiving apparatus without emission of sound from thehorn 12 of the machine, ametal sleeve 264, Fig. 7, is mounted in thebody portion 2 of the casing in electrical connection with the wire 260between the telephone 36 and the ground wire 188. As shown, the metalsleeve 264 is arranged to receive a plug connected with the headband orear telephones, and the switch 254 in the circuit of the telephone 36 isarranged in the machine with reference to the sleeve 264, so that theinsertion of'the plug into the sleeve breaks the circuit of thetelephone 36 at the switch 254 and com pletes a connection from the wire252 through the headband telephone and the sleeve 264 to the wire 260and thence to ground.

The radio receiving apparatus of the machine is thrown into and out ofoperation by a main switch 266, Fig. 1, mounted on the panel 40 of thecover 4 and connected to any desired part of the circuit arrangement ofthe apparatus. As shown in Fig. 9, the switch 266 is connected in thecircuit 234-242, which conducts the heating current to the filamentsof'the vacuum tubes.

In order to prevent sound communicated to the horn 12 through one of itsbranches 18 and 20 from entering the other branch and setting upvibrations therein which might interfere with or deleteriously affectthe quallty of the sound emitted from the horn, the horn is providedwith a valve 267, Fig. 6, pivotally mounted at the junction of thebranches 18 and 20. The valve 267 is arranged to swing between twopositions, in one of which as shown in full lines in Fig. 6, it allowscommunication between the upright branch 18 and the body of the horn andshuts off-communication between the body of the horn and-the lateralbranch 20, and in the other of which, as shown in broken lines in saidfigure, it allows communication between the main body of the horn andthe lateral branch 20 and shuts off communication between the horn andthe upright branch 18. Means is preferably provided for automaticallyoperating the valve 267 so as at all times to allow communicationbetween the main body of the horn and the branch to which sound is beingcommunicated and to shut off communication between the body of the hornand the other branch. As shown, said means comprises an arm 268 fixed tothe valve 267 and normally maintained by a spiral spring 270 intheposition shown in full lines in Fig. 6, in which the main body of thehorn 12 is in communication with the upright branch 18 leading from thephonographic' apparatus and is shut off from communication with thelateral branch 20 connected with the tele-v phone 36 of the radioreceiving apparatus. In order to cause the valve 267 to be moved fromthe full line position to the broken line position, as shown in Fig. 6,upon operation of the radio receiving apparatus, an electromagnet 27 2of the solenoid type is mounted on the horn adjacent to the arm 268, andthe arm 288 is formed with a projection composed of magnetic materialand extended within the electromagnet 27 2. As shown most clearly inFig. 9, the electromagnet 272 is interposed in the filament heatingcircuit of the vacuum tubes, so that when the switch 266 is thrown in toinitiate the operation of the radio receiving apparatus, the current iscaused to flow through the electromagnet. The consequent attraction ofthe arm 268 by the electromagnet 2Y2 swings the valve 267 from the fullline position, shown in Fig. 6, to the broken line position, therebyplacing the body or" the horn 12 in communication with the branch 20 andshutting oii' communication between the main body of the horn and theupright branch 18.

As shown in the drawings, the terminal block 168 on the panel 40 of thecover a is arranged centrally of the rear end oi the panel, and theflexible lead wires 18 i, 200, 248 etc. are led from the terminal block168 along the rear inner surface or" the cover, where they may be heldin place by asuitable cleat274: to

the terminal block 170 which dependsifromthe top plate 22 of the mainbody portion 2 of the casing. The connecting wires between the terminalblockl'YO and the ba tery 166 preferably contained in a single vcable2'?6 extending downwardly to the bottom of the compartment 10 or" thecasing and leading to contacts 278, Fig. 2 secured to the floor of thecompartment 10 and having .the wires connected therewith. The radioreceiving apparatus is so organized that it requires no external sourceof power, only replaceable dry batteries being needed for the vacuumtubes, so that the machine may be used irrespective of any externalpower supply. .The batteries may be installed in a single container orbox 280, Fig. 1, provided on ts bottom with suitable contact platesarranged to engage the contacts 27 8 when the battery is inserted Withinthe casing. The insertion and removal of the batteries may be further lacilitated by the provision of tracks 282 secured to the floor of thecompartment 10 and adapted to slidably engage suitably formed parts onthe battery box 280. To the end that shocks may be avoided, the closingmoyement of the cover l is controlled. by a device 284, Fig. 4e, mountedin the compartment 10 of the body portion 2 of the casing and operatively connected with the cover 4 by a link 286, Fig. 2. Further.disclosure of the battery 1'66'and the means for controlling themovement of the cover t is believed to be unnecessary, inasmuch as theconstruction and arrangement of such parts constitute per se no part ofthe present invention.

Ready and convenient access is permitted to the compartment 10 of thebody portion 2 of the casing of the machine by means of a door 286hinged at 288 at the rear side of the compartment. By reason of thePI'OViS'. ion of the hinged door 286 the battery box 280'may be easilyreplaced, and any necessary or desired repairs or adjustments may bereadily made to the partscontained in the compartment 10, including thehorn 12, the cover controlling means and the telephone 86.

The amplitude of the speech or music emitted by theradio receivingapparatus may be increased or decreased by effecting a closer or loosercoupling between the coil 48 of the secondary tuning. circuit and theprimary coil d6 of the antenna circuit. Such an adjustment may beeffected by turning the knob 290 mounted on the exposed side of thepanel 40, Fig. l and provided with suitable means for indicating theappropriate adjustment for rendering the sound louder or softer.

From the foregoing, it will be understood thatthe condensers 52 and 54in the primary and secondary tuning circuits respectively, of the radioreceiving apparatus, the knob 148 for operating the switches 128 and134; of the inductance coils 46 and 50- and the switches 10% and 120 ofthe radio frequency transformers 116, the main switch 266, and the knob290.constitute controlling elements for the radio'receiving apparatusand that these elements-are extended through the panel 40 of the cover lso as to enable them,

to be operated "from the exposed side of the panel. It will also beunderstood by reference particularly to Fig. 5 that by the provision ofthe radio receiving apparatus on a movable member, such as the cover 4of the machine, the controlling elements of the radio receivingapparatus may normally, that is, in the closed positionof the cover orother movable mounting be arranged in close juxtaposition to thecontrolling, elemerits of the phonographic apparatus so as to conservespacewithin the machine casing.

For the sake of clearness of illustration, the cover 4: as shown in Fig.5 of the drawings, is relatively deep, and the controlling elements oi":the radio receiving apparatus are spaced somewhat further than isnecessary from the phonographic apparatus. It will, therefore be seenthat the radio receiving apparatus may be installed in a cover ofconsiderably less depth than that shown in F i n. 5 without danger ofinterference with the sound box 26 or other parts of the phonographicapparatus of the sound reproducing machine. When the cover 4 is in itsnormal or closed position, the controlling elements of the radioreceiving apparatus are invisible, so that-the sound reproducing machineof the present invention may be caused to present a smooth and unbrokenappearance over its entire exterior surface. It will be noted, however,that when the cover 4 is opened, the controlling elements of the radioreceiving apparatus are moved away from the phonographicapparatus so asto render them not only visible, but also readily accessible to theoperator. In fact, when the cover 4 is fully opened, the controllingelements of the radio receiving apparatus are mounted on the front faceof the cover, Fig. 1 in an extemely convenient position for actuation bythe operator. Furthermore, the provision of theradio receiving apparatusin the cover of the machine casing enables a sound reproducing machinecomprising both phonographic and radio receiving apparatus to beconstructed with no greater expense as to the cabinet part of themachine than in the case of a phonograph only, inasmuch as the radioreceiving apparatus is mounted in a space, which in a phonograph istotally unused.

The operation of the controlling elements of the radio receivingapparatus is facilitated in the illustrated machine, not only bymounting the radio receiving apparatus on the machine in such a manneras to render its controlling elements extremely convenient for normaloperation, but also by the provision of means for indicating the orderin which the controls of the radio receiving apparatus should beadjusted. Such indicating means is shown most clearly in Fig. 1 whereinthe numerals 1, 2, 3, 4 and 5 are applied respectively to the mainswitch 266, the wave length controlling means 148, the tuning condenser54 of the secondary circuit, the condenser 52 of the primary circuit andthe knob 290 for regulating the loudness of the sound emitted from themachine. The numbers 1, 2, 3, 4 and 5 indicate to an unskilled operatorthat in the operation of the radio receiving apparatus the main switch266 should first be closed, that the knob 148 should then be set inaccordance with the wave length of the station which it is desired toreceive; that the secondary condenser 54 should next be also adjusted tothe desired wave length, and that the condenser 52 which may or may notbe graduated should then be turned to the position which affords thebest response, the knob 290 being finally set in the proper positiondepending upon whether it is desired that the speech or music beingemitted from the machine be loud or soft. The provision of theabove-described means distinct from the controlling elements of theradio receiving apparatus for indicating the order in which the controlsshould be operated, enables the production for the first time, so far asapplicant is aware, of a radio receiving set which can be operated by anunskilled or uritrained person with practically as good results as by askilled operator, and hence constitutes an important practical advancein the development of radio receiving apparatus for purposes of publicinformation and entertainment.

The radio receiving apparatus of this invention may not only beincorporated in new.

sound reproducing machines comprising radio receiving apparatus andphonographic apparatus, but it may also be applied as a radio adjunct orreceiver to phonographs already constructed and in use. Moreover, byreason of the construction and arrangement of the radio receivingapparatus, it may be applied to existing phonographs having compartmentsfor containing phonographic apparatus and record albums respectively,without increasing the size of the phonograph casing or reducing theavailable size of any of its compartments, so that the usefulness of thephonograph is in no way affected or its operation interfered with by theaddition of the radio receiver. The radio receiver is also soconstructed that it may be applied to any suitable phonograph by a localelectrician or carpenter.

Having described my invention, What I claim 1s:

1. In a sound reproducing machine, a casing comprising a main bodyportion and a member mounted on the body portion for movement relativelythereto, a horn mounted in said body portion, and radio receivingapparatus mounted on said movable member and comprising controllingelements normally contained within the casing so as to be invisible,said member and said controlling elements being so'constructed andarranged as to render the controlling elements visible and readilyaccessible to the operator upon movement of the member relatively to thebody portion of the casing.

2. In a sound reproducing machine, a casing, a horn supported by thecasing, a panel normally mounted on the casing with its under sidefacing toward the horn, and radio receiving apparatus mounted on theupper sideof the panel and comprising controlling elements extendedthrough the panel for adjustment from the under side of the panel, saidpanel being so mounted on the casing as to enable it to be swungupwardly into a position in which the under side of the panel facesforwardly of the machine so as to cause the controlling elements of theradio receiving apparatus to be disposed in convenient positions formanipulation by the opera tor.

3. In a sound reproducing machine, a cas- 'ig comprising a main bodyportion and a cover portion, a horn installed in the main body portionof the casing, a panel mounted on the cover and spaced from the top wallare of the cover to provide a chamber between said panel and said top.wall, and radio receiving apparatus mounted on the panel within saidchamber, said cover being mounted on the body portion of the casing soas to enable it to be swung upwardly and backwardly to an open positionin which the exposed side of the panel faces forwardly of the machine,said radio apparatus comprising vacuum tubes and also comprisingcontrolling elements extended through the panel for adjustment from theexposed side of the panel when the cover is in open position, and saidpanel being perforated to receive said tubes and thereby enable them tobe rendered accessible from the exposed side of the panel.

4. In a sound reproducing machine, a casing, a panel connected to thecasing for movement relatively thereto between closed and open positionsand arranged in its closed position with one of its sides facing towardsthe body of the casing, and radio receiving apparatus mounted on theopposite side of the panel from said first mentioned side and comprisingcontrolling elements extended through the panel for adjustment from thefirst-mentioned side when the panel is in open position.

5. In a sound reproducing machine, a casing, a panel hingedly connectedto the casing for movement relatively thereto, and radio apparatusmounted on one side of the panel and comprising vacuum tubes andcontrolling elements, said panel being perforated to receive the vacuumtubes and thus enable them to be rendered accessible from the oppositeside of the panel and said radio apparatus having its controllingelements extended throug.1 the panel for adjustment from the oppositeside of the panel.

6. In a sound reproducing machine, a casing, a two-part cover hingedlyconnected to the casing and comprising a top wall and a member spacedfrom said top wall to provide a chamber between said wall and saidmember and radio receiving apparatus mounted on the cover within saidchamber and comprising controlling elements extended through one oftheparts of the cover for adjustment from an exposedside of the cover.

7. In a sound reproducing machine, a cas ing, a two-part cover hingedlyconnected to the casing and comprising a panel spaced from the top wallof the cover, and radio receiving apparatus mounted on the panel betweensaid panel and said top Wall, said radio apparatus comprisingcontrolling elements extended through the panel for adjustment from theexposed side of the panel.

8. In a sound reproducing machine, a casing comprising amain bodyportion and a cover portion, a panel mounted on the cover portion andspaced from the top wall of the cover portion to provide a chamberbetween said panel and said top wall and radio receiving apparatusmounted on the panel within said chamber, said radio apparatuscomprising vacuum tubes and also comprising controlling elementsextended through the panel for adjustment from the exposed side of thepanel, and said panel being perforated to receive said tubes and therebyenable them to be rendered accessible from the exposed side of thepanel.

9. In a sound reproducing machine, a casing comprising a body portionand a two-part cover formed to provide a chamber, radio apparatusmounted within the chamber of the two-part cover and comprising vacuumtubes and controlling elements extending through one of the parts of thecover for replacement and adjustment respectively from a positionoutside of said chamber.

ALFRED N. GOLDSMITH.

